Decorators in Python

Decorators in Python is basically meta programming. To understand decorators in Python, some things will be clear:

• function are high-order objects

• you can pass functions as arguments

• you can declare inner functions

Now, it’s elementary to create one decorator:

import time


def time_execution(function):
    def wrapper():
        start_time = time.time()
        function()
        end_time = time.time()
        print("[{function}] Time Execution: {total_time}".format(
            function=function.__name__,
            total_time=str(end_time - start_time))
        )

    return wrapper

@time_execution
def main():
    for n in range(0, 10000000):
        pass

main()

First thing, we import the module time. Second, we use the sugar syntax “@”. This indicates to the Python that is a decorator. The core is the function “time_execution”. Her reception on function and involves the real function, called of “wrapper”. So, you first decorator works fine.

and that’s all folks!

If you have any doubts, problems or suggestions, just leave a message.